278 lines
16 KiB
JSON
278 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-40957",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-07-12T12:17:45.593Z",
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"datePublished": "2024-07-12T12:31:59.747Z",
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"dateUpdated": "2026-08-05T11:34:16.301Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:34:16.301Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nseg6: fix parameter passing when calling NF_HOOK() in End.DX4 and End.DX6 behaviors\n\ninput_action_end_dx4() and input_action_end_dx6() are called NF_HOOK() for\nPREROUTING hook, in PREROUTING hook, we should passing a valid indev,\nand a NULL outdev to NF_HOOK(), otherwise may trigger a NULL pointer\ndereference, as below:\n\n [74830.647293] BUG: kernel NULL pointer dereference, address: 0000000000000090\n [74830.655633] #PF: supervisor read access in kernel mode\n [74830.657888] #PF: error_code(0x0000) - not-present page\n [74830.659500] PGD 0 P4D 0\n [74830.660450] Oops: 0000 [#1] PREEMPT SMP PTI\n ...\n [74830.664953] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011\n [74830.666569] RIP: 0010:rpfilter_mt+0x44/0x15e [ipt_rpfilter]\n ...\n [74830.689725] Call Trace:\n [74830.690402] <IRQ>\n [74830.690953] ? show_trace_log_lvl+0x1c4/0x2df\n [74830.692020] ? show_trace_log_lvl+0x1c4/0x2df\n [74830.693095] ? ipt_do_table+0x286/0x710 [ip_tables]\n [74830.694275] ? __die_body.cold+0x8/0xd\n [74830.695205] ? page_fault_oops+0xac/0x140\n [74830.696244] ? exc_page_fault+0x62/0x150\n [74830.697225] ? asm_exc_page_fault+0x22/0x30\n [74830.698344] ? rpfilter_mt+0x44/0x15e [ipt_rpfilter]\n [74830.699540] ipt_do_table+0x286/0x710 [ip_tables]\n [74830.700758] ? ip6_route_input+0x19d/0x240\n [74830.701752] nf_hook_slow+0x3f/0xb0\n [74830.702678] input_action_end_dx4+0x19b/0x1e0\n [74830.703735] ? input_action_end_t+0xe0/0xe0\n [74830.704734] seg6_local_input_core+0x2d/0x60\n [74830.705782] lwtunnel_input+0x5b/0xb0\n [74830.706690] __netif_receive_skb_one_core+0x63/0xa0\n [74830.707825] process_backlog+0x99/0x140\n [74830.709538] __napi_poll+0x2c/0x160\n [74830.710673] net_rx_action+0x296/0x350\n [74830.711860] __do_softirq+0xcb/0x2ac\n [74830.713049] do_softirq+0x63/0x90\n\ninput_action_end_dx4() passing a NULL indev to NF_HOOK(), and finally\ntrigger a NULL dereference in rpfilter_mt()->rpfilter_is_loopback():\n\n static bool\n rpfilter_is_loopback(const struct sk_buff *skb,\n \t const struct net_device *in)\n {\n // in is NULL\n return skb->pkt_type == PACKET_LOOPBACK ||\n \t in->flags & IFF_LOOPBACK;\n }"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The crash is triggered by a received IPv6 packet whose destination matches a configured SRv6 End.DX4/End.DX6 SID, processed in the receive softirq path (`lwtunnel_input` → `seg6_local_input_core`). No local access or account on the router is needed — any host able to route a packet to the SID reaches the code.\nAC:L - Once the target runs the affected (supported, documented) SRv6 + netfilter configuration, a single crafted packet deterministically dereferences NULL — no race, no memory-layout dependence, no information the attacker must first gather. The required rpfilter/fib-check rule is the default in firewalld-based distros, and the `nf_hooks_lwtunnel` gate can even be flipped host-wide by any local unprivileged user via a user namespace.\nPR:N - Packet processing happens before any authentication or authorization; the attacker needs no credentials or privileges on the target at all, only the ability to send a packet to the SID.\nUI:N - The crash occurs entirely in the kernel's packet receive path with no action by any local user or administrator beyond the pre-existing configuration.\nS:U - The NULL dereference occurs in the kernel of the machine receiving the packet, and the impact is confined to that same kernel/security authority — no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The fault is a read of a fixed small offset (0x90) from a NULL pointer, which is unmapped; nothing is returned to the attacker and no kernel memory contents are exposed.\nI:N - No memory is written and no data is modified — the bug is a read-only dereference of a NULL device pointer, which cannot be leveraged into a write or control-flow primitive.\nA:H - The NULL dereference happens in softirq/interrupt context during NAPI receive processing, producing a kernel oops that panics or renders the router unusable, and it can be re-triggered by every subsequent packet."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/ipv6/seg6_local.c"
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],
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"version": "7a3f5b0de3647c854e34269c3332d7a1e902901a",
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"lessThan": "af90e3d73dc45778767b2fb6e7edd57ebe34380d",
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"status": "affected",
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"net/ipv6/seg6_local.c"
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],
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{
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"version": "5.15",
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"status": "affected"
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{
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"version": "0",
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"status": "unaffected",
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},
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{
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"version": "5.15.162",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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"version": "6.1.96",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.36",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.9.7",
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"lessThanOrEqual": "6.9.*",
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"status": "unaffected",
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},
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{
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"version": "6.10",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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"role": "CISA Coordinator",
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